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lynx-chess / Lynx

Chess Engine, written in C#
https://lichess.org/@/Lynx_BOT
MIT License
39 stars 3 forks source link

⚖️ 'Bad' bishop penalty #1016

Closed eduherminio closed 3 days ago

eduherminio commented 5 days ago

Simple impl, single value vs next impl

Test  | eval/eval/bad-bishop-penalty-retune-1
Elo   | -8.05 +- 5.65 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=32MB
LLR   | -2.25 (-2.25, 2.89) [0.00, 3.00]
Games | 6866: +1902 -2061 =2903
Penta | [229, 835, 1417, 770, 182]
https://openbench.lynx-chess.com/test/734/

Convert to array and add tuned values See #1022

Use pawn diff

Use improved pawn diff

Test  | eval/bad-bishop-penalty-retune-3
Elo   | -1.75 +- 3.12 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=32MB
LLR   | -2.27 (-2.25, 2.89) [0.00, 3.00]
Games | 22690: +6337 -6451 =9902
Penta | [661, 2802, 4531, 2692, 659]
https://openbench.lynx-chess.com/test/735/
eduherminio commented 5 days ago

Add blocked pawns?